F.4 Chem pH value

So,NO solution can have hydrogen ions of concentration greater than
10^-0=1 mol dm^-3 ?

No! 當然有SOLUTION既concentration係過左1M.

e.g.2M HCl, 有2M H+ ions when compleletly disociates in water.

but it is off the scale. The pH scale is generally restricted to living organisms and their environments. 2M HCl would kill anything it came into close and prolonged contact with.

More often than not there is a maximum concentration of H+ ions that the acid will produce. The dissociation reaction is dynamic ( a 2 way reaction)
HX <----> H+ + X-
The amount of dissociation is indicated by its dissociation constant (Kp
呢d 遲De quillibrium會講

And,No solution can have hydrogen ions of concentration smaller than
1x10^-14 mol dm^-3 ?
一樣原理

pH can be up to 15 or down to -1.

However, pH scale is usually from 0 to 14. The reason is NOT that pH is "restricted to living organisms and their environments."

The reason is included in the formal A-level syllabus, and perhaps now U-level.